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I don’t know how versed you are with image editing, but without trying to drown you in details:

After you have an image open:

Create a new layer (+ sign over on the right next to base image)

Paint THE LAYER black (big marker or paint brush on left)

Set the transparency to 50% or so while you edit THE LAYER so you can see what you’re doing (click three dots way over on right on the layer for drop-down)

Cut out sections from THE LAYER as you reveal (a Scissor button on left, be sure to select REMOVE)

Heh; shape of the box, and picking a title that I doubt saw physical release on other platforms.

Hehe, a big reason I selected this game is because it, and games like it (many indie and AA games), saw physical releases on Switch and nowhere else. So many games now days don’t even have genuine box art any more, just Steam title pages or Microsoft Store thumbnails etc.